CN102656962A - Noise absorbing fabric - Google Patents
Noise absorbing fabric Download PDFInfo
- Publication number
- CN102656962A CN102656962A CN2010800572161A CN201080057216A CN102656962A CN 102656962 A CN102656962 A CN 102656962A CN 2010800572161 A CN2010800572161 A CN 2010800572161A CN 201080057216 A CN201080057216 A CN 201080057216A CN 102656962 A CN102656962 A CN 102656962A
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- China
- Prior art keywords
- silk
- metal
- cloth
- noise absorption
- absorption cloth
- Prior art date
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- Granted
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Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/005—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems using woven or wound filaments; impregnated nets or clothes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0084—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising a single continuous metallic layer on an electrically insulating supporting structure, e.g. metal foil, film, plating coating, electro-deposition, vapour-deposition
Abstract
Disclosed are: a noise absorbing fabric in which electromagnetic waves are not susceptible to being reflected, and which has excellent noise absorption ability; a noise absorbing fabric which has noise absorption ability across a wide band; a noise absorbing fabric which is soft, elastic, and thin, and which can be incorporated into a complicated section of an electronic component, housing, or the like by being bent, folded, or the like; and a noise absorbing fabric which can be easily and stably produced without using an expensive soft magnetic material, and which is inexpensive and of high performance. The noise absorbing fabric is characterized in that metal is subjected to metal processing on at least one surface of the fabric, wherein the common logarithmic value of the surface resistivity of the surface subjected to the metal processing is within the range of 0-4.
Description
Technical field
The present invention relates to the noise absorption cloth and silk that metal processes at the enterprising row metal of at least one face of cloth and silk.
Background technology
Because the real of radio communication machines such as e-machine, mobile phone, WLAN such as PC, large screen television etc. popularized, the information processed amount enlarges markedly.Therefore, these e-machines and radio communication machine be high capacity, highly integrated, high-speed communicationization more, and be strong all the more to the requirement of handling the amount of information of increase as early as possible, more effectively transmit.In order to satisfy these requirements, clock frequency and the employed transmission frequency of e-machine of LSI (Large Scale Integration) are displaced to high frequency side, and the frequency of utilizing of communicating machine also becomes higher.
It was reported that the noise that is produced by e-machine causes other machines generation work condition of poor easily owing to utilize frequency to raise; Because the interference with the electric wave that is utilized in the communicating machine is easy to generate unfavorable condition etc. at aspects such as e-machine, communications.
Therefore; For electronic unit, transmission line etc., for communication system, be purpose perhaps to prevent electromagnetic interference; As so-called EMC (Electro Magnetic Compatibility) countermeasure, the necessity that absorbs the noise absorption body of the noise that is produced by e-machine strengthens.
And, having changed popular society into, the PC of mobile model increases, and mobile phone is more miniaturization and high performance also.Therefore, needing can miniaturization and light-weighted equipment, material etc.
Disclose soft magnetic material in the patent documentation 1 and 2 and be scattered in the noise absorption sheet material that forms in the resin, by practicability.The principle of above-mentioned noise absorption sheet material performance performance is that the soft magnetic material that is scattered in the resin is caught electromagnetic wave, carries out magnetic polarization, because the magnetic loss of this moment, electromagnetic wave changes heat energy into.Because above-mentioned soft magnetic material is powder, therefore need be mixing in resin, disperse, but because soft magnetic material is the high powder of hardness, therefore be difficult to it is scattered in the resin with higher concentration equably.In addition, because the sheet material of making is difficult on roller, reel, therefore be not suitable for the continuous production of electronic equipment etc.
And then because the sheet material of above-mentioned noise absorption sheet material for hyperbaric soft magnetic powder being disperseed form, thickness is also thick, so be difficult to be fit into narrow place.In addition, the matrix resin of above-mentioned noise absorption sheet material considers that ease of use selects rubber-like substance always, uses but be difficult to be fit into the high place of curvature and be difficult to bending.
And then, in order to tackle higher frequency, known by with soft magnetic material form and structure complicated and powder be used for the noise absorption sheet material.For example, also attempted using rare metal and/or trace element to prepare more complicated compound as the raw material of soft magnetic material, thus control magnetic, but produced the problem of cost.Also attempted the polarization of the soft magnetic material raising soft magnetic material of use needle-like, flakey etc., but the rising of the concentration of soft magnetic material is very difficult to process uniform sheet material, existing problems aspect cost and the property handled.
In addition, known with the magnetic material headed by the above-mentioned soft magnetic material only to a certain specific frequency performance effect, be difficult to absorb wide band noise.
Therefore, also studied and mixed, carry out sheet materialization again the effective particle of various frequencies.But, during hybrid particles, exist the effect of each particle to reduce, be difficult to absorb wide band noise and then be difficult to problem such as sheet materialization.
The noise absorption sheet material that soft magnetic material or metal are processed on the surface of resin sheet is disclosed in the patent documentation 3 and 4.But, because above-mentioned noise absorption sheet material vapor deposition on resin sheet, film like material has soft magnetic material or metal, thereby surface smoothing, be difficult to more high performance.Therefore,, also attempted dividing function, carried out multiple stratification, laminationization, but high performance is difficult in order to realize high performance, and thicker and be difficult to use.
Sheet composite magnetic and noise absorption body are disclosed respectively in the patent documentation 5 and 6.But the article of record all have level and smooth surface in the patent documentation 5 and 6, thereby because the conductivity that metal itself is had, electromagnetic reflection grow hinders absorption of electromagnetic wave.
Shown in patent documentation 3～6; When on even surfaces such as film, sheet material, forming the layer of magnetic material or metal material, the layer of magnetic material or metal material becomes level and smooth, and the original conductivity that has of magnetic material or metal material is significantly changed; Because its bigger conductivity, electromagnetic wave is reflected.These absorb noise, not equal to owing to electromagnetic wave resonance increase noise.
The noise absorption sheet material that layer that will contain conducting fibre and the laminated that contains magnetic material form is disclosed in the patent documentation 7.But the noise absorption performance of the noise absorption sheet material of patent documentation 7 mainly is to be produced by magnetic material, and does not know whether conducting fibre has the noise absorption performance.And then, in the field that ratio is big, conductivity is excessive of conducting fibre, there is electromagnetic reflection grow, encumbers the problem of absorbent properties.
In addition, in the patent documentation 8, conducting fibre is scattered in the resin, replaces disclosed soft magnetic material in the patent documentation 1 or 2.But employed conducting fibre is common material in the patent documentation 8, does not have the noise absorption performance.That is, owing to conducting fibre is scattered in the resin as the replacement of the soft magnetic material of needle-like seemingly, thereby its noise absorption performance is not as good as the resin dispersion sheet material products of the soft magnetic material described in the patent documentation 1.In addition, action principle is not clear and definite yet, can not bring into play the noise absorption performance fully, and electromagnetic hyperreflexia etc., do not have practicality as the noise absorption sheet material.
The prior art document
Patent documentation
Patent documentation 1: japanese kokai publication hei 9-93034 number
Patent documentation 2: TOHKEMY 2005-251918 number
Patent documentation 3: TOHKEMY 2005-101474 number
Patent documentation 4: TOHKEMY 2006-93414 number
Patent documentation 5: TOHKEMY 2006-60008 number
Patent documentation 6: TOHKEMY 2006-295101 number
Patent documentation 7: TOHKEMY 2008-186997 number
Patent documentation 8: TOHKEMY 2008-118116 number
Summary of the invention
The problem that invention will solve
As stated, in the past noise absorption article have problems at aspects such as ease of use, noise absorption performances.
Therefore, problem of the present invention is, a kind of noise absorption cloth and silk that is difficult to reflection electromagnetic wave and noise absorption excellent performance is provided.
Another problem of the present invention is, a kind of noise absorption cloth and silk with noise absorption performance of broad frequency range is provided.
And then problem of the present invention is, a kind of softness, rich flexibility and thin and can be fit into the noise absorption cloth and silk in the complicated part of electronic unit, housing etc. through crooked, folding etc. are provided.
And then problem of the present invention is, provide a kind of do not use expensive soft magnetic material, can simple and easy and that stably produce, cheap and high performance noise absorption cloth and silk.
The scheme that is used to deal with problems
The application inventor furthers investigate in order to solve above-mentioned problem, and the result finds, through a kind of noise absorption cloth and silk, can solve above-mentioned problem, thereby accomplish the present invention.Above-mentioned noise absorption cloth and silk is characterised in that, its noise absorption cloth and silk for metal is processed at the enterprising row metal of at least one face of cloth and silk is in the scope of common logarithm value 0～4 of the surface resistivity of the face of metal processing.
Particularly, the present invention relates to following mode.
[mode 1]
A kind of noise absorption cloth and silk is characterized in that, the noise absorption cloth and silk that it processes through metal at least one face of cloth and silk for metal,
In the scope of common logarithm value 0～4 of the surface resistivity of the face of metal processing.
[mode 2]
According to mode 1 described noise absorption cloth and silk, wherein, inner conductivity is also littler through the conductivity of the face of metal processing than said metal.
[mode 3]
According to mode 1 or 2 described noise absorption cloth and silks, wherein, said cloth and silk is the nonwoven fabrics that is formed by synthetic continuous fibre.
[mode 4]
According to each described noise absorption cloth and silk in the mode 1～3, wherein, said cloth and silk comprises the layer of the fiber with the fibre diameter below the 7 μ m.
[mode 5]
According to each described noise absorption cloth and silk in the mode 1～4, wherein, said metal carries out metal processing through the metal evaporation method.
[mode 6]
According to each described noise absorption cloth and silk in the mode 1～5, wherein, the thickness of said metal is 2～400nm.
[mode 7]
According to each described noise absorption cloth and silk in the mode 1～6, wherein, the thickness of said cloth and silk is 10～400 μ m, and basic weight is 7～300g/m
2
[mode 8]
According to each described noise absorption cloth and silk in the mode 1～7, wherein, said cloth and silk is through rolling processing.
[mode 9]
According to each described noise absorption cloth and silk in the mode 1～8, wherein, the average perforate of said cloth and silk directly is 0.5 μ m～5.0mm.
[mode 10]
According to each described noise absorption cloth and silk in the mode 1～9, wherein, said metal does not have the metal of magnetic for one or more.
[mode 11]
According to each described noise absorption cloth and silk in the mode 1～9, wherein,, said metal is able to carry out metal processing thereby carrying out vapor deposition through the metal that one or more is had valve action.
[mode 12]
A kind of noise absorption article, it comprises each described noise absorption cloth and silk in the mode 1～11.
The effect of invention
Noise absorption cloth and silk of the present invention is difficult to reflection electromagnetic wave and noise absorption excellent performance.
Noise absorption cloth and silk of the present invention also has the noise absorption performance of broad frequency range.
And then noise absorption cloth and silk of the present invention is soft, rich flexibility and thin and can be fit in the complicated part of electronic unit, housing etc. through crooked, folding etc.
And then, noise absorption cloth and silk of the present invention do not use expensive soft magnetic material, can simple and easy and production stably, cheapness and high-performance.
Description of drawings
Fig. 1 is the sketch map in the cross section of expression noise absorption cloth and silk of the present invention.
Fig. 2 is with the sketch map after the cross section expansion of a form of noise absorption cloth and silk of the present invention.
Fig. 3 is the figure of gradient that is used to explain the conductivity of noise absorption cloth and silk of the present invention.
Fig. 4 is the figure that is used to explain metal cluster.
Fig. 5 utilizes the sketch map of a form of the lamination state of the metallic particles on the fiber of metal evaporation method for expression.
Fig. 6 is the figure that is used to explain the microstrip line method.
Fig. 7 is the mensuration result's who passes through the microstrip line method among the expression embodiment 1 figure.
Fig. 8 is the mensuration result's who passes through the microstrip line method among the expression embodiment 4 figure.
Fig. 9 is the mensuration result's who passes through the microstrip line method among the expression embodiment 6 figure.
Figure 10 is the mensuration result's who passes through the microstrip line method in the expression comparative example 6 figure.
Figure 11 is the sketch map that is used to explain loop aerial A method.
Figure 12 is the sketch map that is used to explain loop aerial B method.
The figure of the coupling attenuation amount of utilizing loop aerial A method of the noise absorption cloth and silk that Figure 13 is formed by embodiment 6 for expression.
The figure of the coupling attenuation amount of utilizing loop aerial A method of the noise absorption base material that Figure 14 is formed by comparative example 6 for expression.
The figure that utilizes loop aerial B method of the noise absorption cloth and silk that Figure 15 is formed by embodiment 6 for expression through attenuation.
The figure that utilizes loop aerial B method of the noise absorption base material that Figure 16 is formed by comparative example 6 for expression through attenuation.
Figure 17 attaches the figure based on the drawing result of the magnetic field intensity of noise absorption property visualization device of demonstration substrate before the noise absorption cloth and silk for expression.
Figure 18 attaches the figure based on the drawing result of the magnetic field intensity of noise absorption property visualization device of demonstration substrate behind the noise absorption cloth and silk that is formed by embodiment 6 for expression.
Figure 19 attaches the figure based on the drawing result of the magnetic field intensity of noise absorption property visualization device of demonstration substrate behind the noise absorption base material that is formed by comparative example 6 for expression.
Figure 20 attaches the figure based on the drawing result of the electric field strength of noise absorption property visualization device of demonstration substrate before the noise absorption cloth and silk for expression.
Figure 21 attaches the figure based on the drawing result of the electric field strength of noise absorption property visualization device of demonstration substrate behind the noise absorption cloth and silk that is formed by embodiment 6 for expression.
Figure 22 attaches the figure based on the drawing result of the electric field strength of noise absorption property visualization device of demonstration substrate behind the noise absorption base material that is formed by comparative example 6 for expression.
Description of reference numerals
1 noise absorption cloth and silk
2 cloth and silks
3 metals through metal processing
4 fibers
5 metal clusters
6 metallic particles
7 microstrip line fixtures
8 samples
9 network analyzers
10 microstrip lines
11 annular-ring microstrip antennas
12 annular-ring microstrip antenna fixtures
13 demonstration substrates
Embodiment
Below noise absorption cloth and silk of the present invention is specified.
Noise absorption cloth and silk of the present invention is processed metal at the enterprising row metal of at least one face of cloth and silk.
Fig. 1 is the sketch map in the cross section of expression noise absorption cloth and silk of the present invention.The metal 3 that the noise absorption cloth and silk 1 of Fig. 1 comprises cloth and silk 2 and processes through metal.
Fig. 2 is with the sketch map after the cross section expansion of a mode of noise absorption cloth and silk of the present invention.The noise absorption cloth and silk 1 of Fig. 2 comprises cloth and silk 2, through the metal 3 of metal processing, be formed on the fiber 4 that constitutes cloth and silk 2 through the metal 3 of metal processing.
Need to prove, among Fig. 2, for ease the cross section of fiber is all represented just to justify.
The surface resistivity through the face of metal processing of noise absorption cloth and silk of the present invention is (in the scope of common logarithm value 0～4 of Ω/).The common logarithm value of surface resistivity is meant, surface resistivity is made as the X (log during Ω/)
10The value of X.During the common logarithm value less than 0 of above-mentioned surface resistivity, conductivity is excessive, and electromagnetic wave more accurately is reflected the noise absorption poor performance in the face place major part of processing through metal on the surface of above-mentioned noise absorption cloth and silk.When little, the electromagnetic reflection of conductivity was big, the interference between generating electromagnetic waves hindered noise absorption property.
On the other hand, the common logarithm value of above-mentioned surface resistivity surpasses at 4 o'clock, and electromagnetic wave sees through the noise absorption cloth and silk sometimes, absorption of electromagnetic wave performance (capturing ability) is relatively poor.The common logarithm value of above-mentioned surface resistivity is in 0～4 scope the time; The electromagnetic wave appropriateness gets into the inside of noise absorption cloth and silk of the present invention, and the electromagnetic wave of entering is caught through the metal of metal processing, changes into; And then change heat energy into through resistance, thereby the noise absorption performance increases.The common logarithm value of the surface resistivity of above-mentioned noise absorption cloth and silk is preferably in 0.1～3 scope.
Above-mentioned surface resistivity can use the system low ohmmeter Loresta-GP of Mitsubishi Chemical Ind, model MCP-T600 to measure through 4 terminal methods.
The preferred inner conductivity of above-mentioned noise absorption cloth and silk is littler through the conductivity of the face of metal processing than metal.As making the inner conductivity example littler than the conductivity of metal machined surface, the ratio that can enumerate the metal in the total amount of metal and cloth and silk of inside of the noise absorption cloth and silk of the present invention of sening as an envoy to is lower than this ratio of the face that metal is processed through metal.Fig. 3 is the figure of gradient that is used to explain the conductivity of noise absorption cloth and silk of the present invention.The noise absorption cloth and silk 1 of Fig. 3 comprises cloth and silk 2 that is formed by fiber 4 and the metal of processing through metal 3.Among Fig. 3, inner (below) is lower with respect to the ratio of the metal of the total amount of metal and cloth and silk with respect to the ratio specific surface (top) of the metal of the total amount of metal and cloth and silk.Therefore, the conductivity of the inside of the noise absorption cloth and silk 1 of Fig. 3 is littler than its surface.
Need to prove, among Fig. 3, for ease the cross section of fiber is all represented just to justify.In addition, in this specification, " conductivity " is meant the degree of conductivity.
Because the gradient of the appropriateness of conductivity, the electromagnetic wave that gets into from the outside is captured in the big part of conductivity, changes electric current into, and particularly more past internal electrical conductance is more little, that is, resistance value is big, so be heat energy through electric resistance changing easily.Thus, can efficient absorb electromagnetic wave well, absorb noise.
The gradient of above-mentioned conductivity can realize through the metal evaporation method of stating after for example.
Above-mentioned noise absorption cloth and silk in the enterprising row metal processing of at least one face of above-mentioned cloth and silk, is processed metal but also can metal be carried out metal on the two sides of above-mentioned cloth and silk.
For the noise absorption cloth and silk that metal is processed at the enterprising row metal in the two sides of this cloth and silk; Preferred inner conductivity is littler through the conductivity of at least one face of metal processing than above-mentioned metal, and more preferably inner in addition conductivity is littler through the conductivity of two faces of metal processing than above-mentioned metal.
In the noise absorption cloth and silk of the present invention, base material is that the aggregate of fiber is a cloth and silk.Through adopting cloth and silk as base material, soft more, be rich in flexiblely, can adopt more complicated shape in the time of in being fit into e-machine, can be disposed at the position that electronic unit in the housing of e-machine, that integrated level is high produces noise.
Need to prove that in this manual, when abbreviating " cloth and silk " as, the expression metal does not have through metal processing, when being called " noise absorption cloth and silk " in addition, the expression metal is through metal processing.
In addition, through the aggregate that adopts fiber be cloth and silk as base material, can contain a plurality of metal clusters through the metal of metal processing.Fig. 4 is the figure that is used to explain metal cluster.The metal 3 that the noise absorption cloth and silk 1 of Fig. 4 comprises cloth and silk 2 and processes through metal, and the metal of processing through metal 3 is made up of a plurality of metal clusters 5.The resistance value of metal cluster 5 is different separately, also has switch effect (switch effect) sometimes, and the noise absorption performance is higher.
Need to prove, among Fig. 4, likewise the cross section of fiber is all represented just to justify with Fig. 3.
Aggregate through selecting fiber is the base material of cloth and silk as above-mentioned noise absorption cloth and silk, and its intertwined point further increases, and can further bring into play performance.
In addition, the air spots of cloth and silk is sliding, therefore from a direction metal is carried out metal through metal evaporation method etc. and adds man-hour, forms a plurality of metal clusters, sees on the microcosmic that resistance value is because of local different.Therefore, the electromagnetic wave that gets into from the outside is had the metal cluster of certain conductivity and resistance value catches, and changes electric current into, is heat energy through electric resistance changing then, thereby brings into play its noise absorption property.This point is the more different point that has the material of smooth surface with in the past film or sheet material etc.Promptly; For the material that metal is processed at the enterprising row metal of smooth surface of film or sheet material etc. through metal evaporation method etc.; Face through metal processing becomes more level and smooth, and the result brings into play the original big conductivity that has of metal, promptly; The common logarithm value of the surface resistivity less than 0 that becomes easily, becoming is easy to generate electromagnetic reflection.In addition,, itself be difficult to its Surface Machining is become uneven, be processed into when inhomogeneous, produce the problem of cost film, sheet material etc.
Employed cloth and silk is the aggregate of fiber among the present invention; Intertwined point between the fiber is many; And its surface inhomogeneous (when a direction is seen, having curvature), add man-hour so carry out metal through metal evaporation etc., form the more uneven metal cluster of electricity; The electromagnetic wave that once is captured more effectively is consumed through resistance, thereby noise absorption cloth and silk of the present invention can have very high noise absorption performance.
Cloth and silk used in the present invention is preferably nonwoven fabrics, and the fiber that forms above-mentioned cloth and silk is preferably the synthetic continuous fibre nonwoven fabrics.
Usually, as far as fabric, compile the cloth and silk of thing etc., fiber is higher along the ratio that the direction such as vertical, horizontal of cloth and silk is orientated.In this case, also be orientated along certain direction through the metal that on cloth and silk, metal is carried out the noise absorption cloth and silk that metal processing forms, noise absorption property has certain directivity.Therefore, when noise comes from certain direction, preferably have, for example fabric and volume thing along the cloth and silk of the fiber of certain orientation orientation.On the other hand, when noise comes from all directions as common e-machine, be preferably the cloth and silk that fiber is not orientated along certain orientation, for example nonwoven fabrics.
In addition, fiber is not when certain orientation is orientated, and reflection is suppressed, and can bring into play higher noise absorption property.Therefore, more preferably among the present invention employed cloth and silk be the mode of nonwoven fabrics.
In addition; When noise absorption cloth and silk of the present invention is used for e-machine; Mostly, cloth and silk is die-cut into complicated shape, is attached on electronic unit or the transmission line or to be attached at the housing of electronic unit first-class and use according to the shape of electronic unit, the shape of circuit-line etc.For fabric, volume thing etc., when being die-cut into complicated shape, sometimes from being produced fibre plate by the end of die-cut part.Above-mentioned fibre plate is followed the metal through metal processing sometimes, and the possibility of the faulty operation that causes short circuit, electronic unit is arranged.
The more preferably cloth and silk through thermosetting of employed cloth and silk among the present invention.Make cloth and silk if add binding agent, binding agent travels in the e-machine sometimes, thereby leads to errors work.Therefore, above-mentioned cloth and silk is preferably and does not use binding agent and synthetic continuous fibre nonwoven fabrics through thermosetting.On the other hand, from the rational viewpoint of the operation of making cloth and silk,, thereby be preferred if can further reduce cost through thermosetting.
Among the present invention, the fiber of formation cloth and silk is preferably can be through the synthetic fibers of thermosetting cloth and silk.In addition, chemical fibres such as paper pulp, staple fibre are because its hydrophily contains moisture sometimes easily.If the moisture that contains is emitted once more, then can cause the misoperation of e-machine, therefore not preferred.
As the concrete example that constitutes the fiber of employed cloth and silk among the present invention; Can enumerate out polyolefin such as polypropylene, polyethylene, polyalkylene terephthalates resin (PET, PBT, PTT etc.) and derivative thereof; Polyamide-based resin and derivatives thereof such as N6, N66, N612; Polyoxymethylene ether is resin (POM etc.), and polyketone such as PEN, PPS, PPO, polyketone resin and PEEK are resin, thermoplastic polyimide resins such as TPI etc. and by these fibers that is combined to form.
The environment that above-mentioned fiber can noise absorption cloth and silk according to the present invention be suitable for is suitably selected, and for example can select as follows.
Because polyamide-based resin or derivatives thereofs such as N6, N66, N612 are the high resin of water absorption rate, therefore compare with other resins, preferably avoid being applicable in the electronic unit of horror moisture.When needing the scolding tin thermal endurance or when having heat because of generations such as electronic units to cause unfavorable condition possible, that is, for requiring stable on heating e-machine, preferably using by PET is that resin, PPS are that resin or PEEK are the fiber that resin forms.On the other hand, when electrical characteristics such as dielectric constant, tan δ were judged, preferred polyolefm resin, PET were that resin, PPS are that resin, PPO are that resin, PEEK are resin and fluorine resin.
Above-mentioned fiber preferably has the fiber of anti-flammability.Because from the viewpoint of the fail safe of electronic unit, the fiber that should adopt igniting to be difficult to burn.
The environment that the fibre diameter of above-mentioned fiber noise absorption cloth and silk according to the present invention is suitable for and difference is preferably below the 50 μ m usually.Because can obtain having the cloth and silk of distance between uniform fibers, can make electromagnetic leakage, for example see through reduce.In addition, because the intensity of fiber is high, in the operation of metal processing, the environment of use etc., the possibility of cloth and silk or the fracture of noise absorption cloth and silk is low, thus can stably process, use etc.
In noise absorption cloth and silk of the present invention, preferred cloth and silk contains the layer of fiber with the fibre diameter below the 7 μ m (below be sometimes referred to as " superfine fibre ").Through containing the layer of superfine fibre, the radical of the fiber of per unit volume increases, and it is big that fiber specific surface area becomes, thus its result, the specific area of metal level also becomes greatly, and the noise absorption performance becomes higher.In addition, through containing the layer of superfine fibre, noise absorption cloth and silk of the present invention attenuation, therefore be suitable for light, thin, short, little be the e-machine of target.In addition, because noise absorption cloth and silk of the present invention attenuation, can sheet material is flexibly crooked, same installation in e-machine also becomes simple and easy, brings into play the noise absorption performance more easily.Employed cloth and silk preferably contains the layer of the fiber with the fibre diameter below the 7 μ m among the present invention, and more preferably contains the layer of the fiber with the fibre diameter below the 4 μ m.
The fibre diameter of above-mentioned superfine fibre is preferably more than the 0.01 μ m, and more preferably more than the 0.05 μ m.
Above-mentioned superfine fibre preferably passes through for example meltblown (meltblown), method of electrostatic spinning manufacturings such as (electrospinning), and more preferably makes through meltblown.
In addition, as stated, in noise absorption cloth and silk of the present invention, optimum fiber does not have random orientation property along the certain orientation orientation.
For the cloth and silk that forms by superfine fibre, the lower tendency of intensity of cloth and silk is arranged, therefore preferred sometimes and have the cloth and silk that the fibre diameter thicker than superfine fibre promptly surpasses the fiber (below be sometimes referred to as " fiber usually ") of the fibre diameter of 7 μ m with containing.
Constitute the not special restriction of cross sectional shape of the fiber of employed cloth and silk among the present invention, in order to form more uneven surfaces, be preferably heterotypic fibre, return silk etc.In addition, based on same purpose, also can be crimped fibre, twist yarn etc.
The not special restriction of the hot strength of employed cloth and silk among the present invention from the operation of metal processing, operability grade when using the noise absorption cloth and silk, is preferably more than the 10N/3cm.Above-mentioned hot strength is that 10N/3cm is when above; In the operation of metals such as vacuum evaporation, sputter processing; Be difficult to produce cloth and silk fracture, wrinkling etc., efficient is carried out metal processing well more, and then can make noise absorption cloth and silk also no problem in the use.Above-mentioned hot strength is more preferably more than the 20N/3cm.
Need to prove that above-mentioned hot strength is meant, except the width setup with test film is the 3cm, the value of measuring according to 5.3 of JIS-L1906:2000.
The thickness of employed cloth and silk is preferably in the scope of 10～400 μ m among the present invention, more preferably in the scope of 15 μ m～200 μ m.During the thickness less than 10 μ m of above-mentioned cloth and silk, carry out metal and add man-hour, do not have the intensity and the hardness of appropriateness, be difficult to carry out metal processing sometimes, and carry out metal and add man-hour, metal passes through the back side and polluting device sometimes.And then, the weak strength of passing through the noise absorption cloth and silk of Punching Technology sometimes.In addition, when the thickness of above-mentioned cloth and silk surpasses 400 μ m, carry out metal and add man-hour, hardness is strong excessively sometimes.And then noise absorption cloth and silk of the present invention is blocked up, is difficult to insert in the narrow sometimes, is difficult to bending, is difficult to fold, is difficult to be fit in the electronic unit.
The thickness of above-mentioned cloth and silk can be measured according to the method for stipulating among the JIS L-1906:2000.
The basic weight of employed cloth and silk is preferably at 7～300g/m among the present invention
2Scope in, more preferably at 15～150g/m
2Scope in.The not enough 7g/m of basic weight
2The time, carrying out metal and add man-hour, metal passes through the back side and polluting device sometimes.And then the weak strength of noise absorption cloth and silk of the present invention is difficult to use in processing, the operation such as die-cut sometimes.Basic weight surpasses 300g/m
2The time, noise absorption cloth and silk of the present invention sometimes becomes overweight.Basic weight is at 7～300g/m
2Scope in the time, noise absorption cloth and silk of the present invention can keep the cloth shape, the property handled is also good.
Above-mentioned basic weight can be measured according to the method for stipulating among the JIS L-1906:2000.
Employed cloth and silk preferably has the average perforate footpath of 0.5 μ m～5.0mm among the present invention, more preferably has the average perforate footpath of 0.5 μ m～3.0 μ m.During average perforate footpath less than 0.5 μ m, the gap is too small, and the distance between metal cluster does not have appropriateness to separate, and can't hinder the circulation of electric current.In addition, do not have appropriateness to separate between the fiber, that is, the intertwined point between the fiber does not increase, and noise absorption property can't increase because of the switch effect.On the other hand, when average perforate directly surpassed 5mm, excesssive gap carried out metal and adds man-hour, can't metal be carried out metal processing equably, was difficult to obtain the resistance value as target.Sometimes add and in equipment, produce unfavorable condition man-hour carrying out metal.When particularly adopting the evaporation coating method of physics for metal processing, metal passes through the back side and contaminated equipment easily.In addition, average perforate directly be that 1mm is when following, because the increase of the intertwined point between the fiber owing to its switch effect, can further improve noise absorption property.Therefore, average perforate footpath further is preferably 0.5 μ m～1.0mm, further is preferably 0.5 μ m～500 μ m, and most preferably is 0.5 μ m～200 μ m.
Above-mentioned average perforate footpath can be measured according to the method for putting down in writing among the embodiment.
In the employed in the present invention cloth and silk, the not special restriction of its method for making can be used the cloth and silk of making through various method for makings.In addition, owing to have the surface texture of appropriateness in the above-mentioned cloth and silk, more preferably roll processing.Through carrying out rolling processing, on the surface of cloth and silk, form the convex-concave of appropriateness, therefore can make metal processing back noise absorption cloth and silk of the present invention have good electrical conductivity, and can have the sheet resistance value of appropriateness.Promptly; Because the cloth and silk as the aggregate of fiber does not have uniform surface as film, under the state of reservation fiber shape, be flattened, so after metal processes; The clustering architecture of stating after noise absorption cloth and silk of the present invention has easily, the noise absorption performance further improves.
" metal processing " among the present invention is to instigate metal to adhere to; Particularly; Be meant on cloth and silk and/or in the cloth and silk, metal is handled attached to constituting the intrastitial of cloth and silk arbitrarily, can enumerate out; Plating method (chemical plating, metallide etc.) of the metal evaporation method of physical property (vapor deposition: EB vapor deposition, ion plating, ion sputtering: high-frequency method, magnetron sputtering method (Magnetron Sputtering Method), subtend target magnetic control sputtering method etc.), chemical etc. for example.The metal evaporation method of physical property is that the metal superfine particle by the surface adsorption of cloth and silk, can be controlled the situation of adhering to of metal through the vapor deposition condition on cloth and silk, thereby in noise absorption cloth and silk of the present invention, forms the gradient of the conductivity of surface and inside easily.In addition, because the surface of each fiber has curvature, thereby when adopting the generation source of particle to be the metal evaporation method of physical property of single direction, on each fiber, form and the corresponding spot of metal thickness easily, thereby be preferred.
Fig. 5 utilizes the sketch map of a mode of the lamination state of the metallic particles on the fiber of metal evaporation method for expression.Among Fig. 5, when carrying out the vapor deposition of physical property from the top, metallic particles 6 is formed on the fiber 4 unevenly.In this case; Part through the thicker of the metal of metal processing is different with the electromagnetic seizure property of the part of thin thickness, in addition, and when the viewpoint of resistance is observed; Spot is arranged; Thereby the measurable electromagnetic wave that is captured becomes electric current, and stream changes heat energy into through resistance during through above-mentioned part, and the noise absorption performance increases.
On the other hand, when using plating method in order to carry out the processing of above-mentioned metal, metal is by plating on the whole at cloth and silk, and metal very equably by lamination, thereby is difficult to form the spot of conductivity on each fiber.Therefore, as above-mentioned metal processing, more preferably the metal evaporation method of physical property.
As above-mentioned metal evaporation method, not special restriction can be selected arbitrary method.For example, the cloth and silk that metal should be carried out metal processing is placed in the evaporation coating device with certain vacuum degree, with certain speed above-mentioned cloth and silk is sent into, and utilizes vapor deposition source to carry out physical property ground vapor deposition and gets final product.For example, during the EB vapour deposition method, make metal particleization, be adsorbed on the cloth and silk with making its physical property with the energy about 1EV.During ion plating, can utilize the energy stronger that the vapor deposition particle is quickened to make it carry out physical absorption than rare gas, EV vapour deposition method, thus can be on the darker direction of cloth and silk evaporation metal.On the other hand, during sputtering method,, be not only the depth direction of cloth and silk because the influence in magnetic field can be carried out the more higher accumulation in energy property ground, according to circumstances, can in fiber, make metal accumulation.In this case, also can in fiber, form the gradient of conductivity, the noise absorption performance increases.Generally speaking, gentle evaporation coating method such as EB vapor deposition is little to the damage of cloth and silk and fiber, but a little less than the adsorption strength to the physical property of fiber surface.On the other hand, strong evaporation coating method such as sputter is big to the damage of cloth and silk and fiber, but high to the adsorption strength of the physical property of fiber surface.Evaporation coating method can be according to the purposes of noise absorption cloth and silk of the present invention and is suitably selected.
Among the present invention; Metal through above-mentioned metal processing does not just have special restriction so long as have the metal of conductivity; Can enumerate out, for example alloy and compound and their mixtures such as their oxide and nitride such as aluminium, tantalum, niobium, titanium, molybdenum, iron, nickel, cobalt, chromium, copper, silver, gold, platinum, lead, tin and tungsten, SUS.
Have the metal of valve action for what is called such as aluminium, tantalums, that is, only obtain the metal that oxide scale film, oxide layer are not easy to be transmitted to metal inside easily on the surface through oxidation, its surperficial conductivity is less, forms thin oxide scale film.In noise absorption cloth and silk of the present invention,,, then, can improve the noise absorption performance, so be preferred in its surperficial and inner conductivity gradient that forms microcosmic property if adopt metal with above-mentioned valve action as the metal that should carry out metal processing.In addition, have the metal of valve action through employing, the oxidation of metal can excessively not carried out in the use, keeps certain sheet resistance value easily.The metal of oxidation has just begun to demonstrate the surface of good resistance value easily, but because environment for use (high humility, hot environment etc.), oxidation is further carried out easily, and sheet resistance value uprises, and might become to bring into play original performance.In addition, also obtain easily after the very big and metal processing for conductivity such as gold, silver, copper for the metal of uniform conductivity, the control difficulty of metal processing, sometimes with film, sheet material etc. likewise conductivity become big.
On the other hand, the metal that is used for above-mentioned metal processing among the present invention can have ferromagnetism, normal magnetic or soft magnetism, also can not have.This point is the point very different with invention in the past, and the present invention is not with based on the magnetic of macroscopic view and produce the purpose that is absorbed as of noise, but to produce the purpose that is absorbed as of noise based on conductivity.For example, the permeability of metallic compound such as iron, nickel permalloy is high.Therefore, prior art is the center with these metallic compounds, for example, mainly uses metallic compounds such as ferrite (ferrite), iron, nickel.Noise absorption sheet material in the past utilize these metallic compounds with soft magnetism or magnetic microparticle performance and bring into play the noise absorption performance.Therefore, the height of permeability is first physical index of its performance of the left and right sides.
From above-mentioned viewpoint, state after the meeting, as end article, when bringing into play the noise absorption performance that produces based on magnetic loss, preferably select the high metal of magnetic susceptibility.As the high metal of magnetic susceptibility, can enumerate out, for example, metallic compounds such as iron, nickel, cobalt and their oxide, nitride.
On the other hand, detest under the situation of magnetic product metal beyond the high metal of preferred above-mentioned magnetic susceptibility and its metallic compound, the metallic compounds such as metal and its oxide, nitride that especially preferably do not have magnetic.Among the present invention, the noise absorption goods of the prior art of the metal high with containing magnetic susceptibility are different, also go for detesting in the goods of magnetic, and preferred execution mode is the noise absorption cloth and silk that contains the metal with magnetic.
The not special restriction of the manufacturing approach of employed cloth and silk among the present invention can be made through the method for common manufacturing fabric, volume thing, nonwoven fabrics etc.When employed cloth and silk was nonwoven fabrics among the present invention, the manufacturing approach of preferred synthetic continuous fibre was spun-bond process, meltblown, flash spinning etc.In addition, when employed cloth and silk is nonwoven fabrics among the present invention, can use utilize short fiber copy paper method, dry process etc.When employed cloth and silk is nonwoven fabrics among the present invention, more preferably use synthetic fibers to make the method for nonwoven fabrics, the noise absorption cloth and silk of can make the intensity height, processing easily.
In addition, as employed cloth and silk among the present invention, the preferably layer through the nonwoven fabrics that will form by superfine fibre and the laminated nonwoven fabric that lamination forms that layer carries out by common fibroplastic nonwoven fabrics.Above-mentioned superfine fibre and common fiber are preferably by thermoplastic resin and form; The layer of the nonwoven fabrics that will form by superfine fibre with layer carry out integrated by common fibroplastic nonwoven fabrics through heat embossing (emboss); Thereby can keep the hot strength and the crooked flexibility of laminated nonwoven fabric, can keep heat-resistant stability.As above-mentioned laminated nonwoven fabric, can enumerate out with the layer of the layer of spun-bonded non-woven fabrics, melt spraying non-woven fabrics, and the layer of spun-bonded non-woven fabrics carry out lamination in proper order with this, thereby then utilize knurling rolls or hot pressing roller to carry out the nonwoven fabrics that crimping is made.
As above-mentioned laminated nonwoven fabric; The preferred following nonwoven fabrics of making: use the layer of thermoplasticity synthetic resin at the spun-bonded non-woven fabrics of weaving more than at least 1 layer on the conveyer belt; Use thermoplasticity synthetic resin to spray the layer of nonwoven fabrics of the superfine fibre of fibre diameter 0.01～7 μ m more than at least 1 layer above that through meltblown; Afterwards, thus use knurling rolls or flat roll to carry out crimping and integrated manufacturing laminated nonwoven fabric.
And then, more preferably used the thermoplasticity synthetic continuous fibre nonwoven fabrics of thermoplasticity synthetic resin before the thermo-compressed more than at least 1 layer in the melt spraying non-woven fabrics laminated, then, thereby utilize knurling rolls or flat roll to carry out crimping and the laminated nonwoven fabric of integrated manufacturing.
For above-mentioned laminated nonwoven fabric; Owing on the layer of the nonwoven fabrics of thermoplasticity synthetic continuous fibre, directly spray layer based on the nonwoven fabrics of the superfine fibre of meltblown; Therefore can make based on the superfine fibre of meltblown and invade in the layer of nonwoven fabrics of thermoplasticity synthetic continuous fibre, the fibre gap of the layer of nonwoven fabrics that can landfill thermoplasticity synthetic continuous fibre.Thus; Be fixed in the nonwoven fabrics through meltblown superfine fibre intrusion thermoplasticity synthetic continuous fibre; Therefore not only the intensity of the structure of laminated nonwoven fabric itself improves, and the layer of the nonwoven fabrics of superfine fibre is difficult to take place mobile because of external force, so be difficult to splitting.The method for making of above-mentioned laminated nonwoven fabric is open in No. the 2010/126109th, No. 2004/94136 brochure of International Publication, International Publication etc.
Under the situation of spun-bonded non-woven fabrics layer, melt-blown nonwoven layer of cloth being carried out the laminated nonwoven fabric that lamination forms, the basic weight of the equal preferred spunbonded nonwoven layer of laminated nonwoven fabric of 3 layers laminated nonwoven fabric and 2 layers adds up to 1.0～270g/m up and down
2, the basic weight of melt-blown nonwoven layer of cloth is 0.3～270g/m
2, and overall basic weight is 7～300g/m
2More preferably the basic weight of spun-bonded non-woven fabrics layer adds up to 3.0～100g/m up and down
2, the basic weight of melt-blown nonwoven layer of cloth is 0.5～120g/m
2, and overall basic weight is 15～150g/m
2
In addition, the fibre diameter of the fiber of spun-bonded non-woven fabrics layer is preferably 4 μ m～50 μ m, 5～40 μ m more preferably, and further be preferably 6～35 μ m.
The fibre diameter of melt-blown nonwoven layer of cloth is preferably below the 7 μ m, more preferably below the 4 μ m.The fibre diameter of melt-blown nonwoven layer of cloth is preferably more than the 0.01 μ m, and more preferably more than the 0.05 μ m.
The noise absorption performance of noise absorption cloth and silk of the present invention is significantly different with the thought of aforementioned prior art; Even noise absorption cloth and silk permeability of the present invention is not high; Say extremely, even have the value of common permeability hardly, also can bring into play high noise absorption performance.Noise absorption cloth and silk of the present invention is through the gradient performance noise absorption performance of conductivity.As described above, the metal processing through on the surface of the cloth and silk that contains superfine fibre, hoping, thus becoming bigger through the area of the face of metal processing, the noise absorption performance uprises.
In addition, the electromagnetic wave that will become noise carries out big branch time-like, can be categorized as electric field composition and magnetic field composition (when being divided near field and far field, its some difference of mechanism), and noise absorption cloth and silk of the present invention is especially to electric field composition performance effect.That is, can think that noise absorption cloth and silk of the present invention brings into play the noise absorption performance through conductivity loss.On the other hand, for the soft magnetic material of having packed into etc., have for the cloth and silk of magnetic, can think through magnetic loss performance noise absorption property.But in becoming the electromagnetic wave of noise, electric field composition and magnetic field composition are the material in showing each other, thereby when arbitrary side brought into play effect, overall noise absorption performance raise.
In noise absorption cloth and silk of the present invention,, can enumerate out following item as using the advantage that does not have the metal of magnetic and bring.For example, as the device that uses in the e-machine in recent years, can enumerate out magnetometric sensor, digital compass, CD, DVD etc.Magnetometric sensor and digital compass can not and be used with the equipment that contains the metal with magnetic.In addition; Utilize magnetic for the device (pick device) of storage medium reading writing information for CD, DVD etc., store according to having or not of magnetic, carry out reading of magnetic basically owing to read the pick device of information; When therefore these devices are near having the metal of magnetic, read bad easily.Therefore, the noise absorption sheet material that contains soft magnetic material particle, particles of magnetic material etc. that uses in recent years can't be used in these devices, but the noise absorption cloth and silk that contains the metal with magnetic can be used for said apparatus.
But, in this specification, do not negate noise absorption performance based on magnetic material, certainly, surface resistivity is in the scope of regulation the time, makes up with the noise absorption performance of magnetic material, can bring into play higher noise absorption performance.For example, the metal that will have magnetic to the part that produces noise because of magnetic carries out metal processing, thereby can make more high performance of noise absorption cloth and silk of the present invention.In addition, noise absorption cloth and silk of the present invention can comprise the sheet magnetic material that contains soft magnetic material.
Among the present invention through the common logarithm value of the surface resistivity of the face of metal processing as long as in the scope 0～4; The just not special restriction of the thickness of above-mentioned metal; The thickness of common above-mentioned metal is preferably in the scope of 2～400nm, more preferably in the scope of 5～200nm.During the thickness of above-mentioned metal is not enough 2nm, conductivity exceeds above-mentioned scope easily sometimes.That is, carry out metal and add man-hour, leave the part that does not form metal, the common logarithm value of surface resistivity surpasses 4 sometimes.On the other hand, when the thickness of above-mentioned metal surpassed 400nm, the thickness of above-mentioned metal was blocked up, and electric current excessively circulates sometimes.That is, when the thickness of above-mentioned metal is blocked up, form layer uniformly, imbed between fiber, the gap between the fiber almost disappears, and reduces easily based on the noise absorption performance of switch effect.
Need to prove, in this specification, the thickness of above-mentioned metal can measure according to SEM photograph image etc.
In the noise absorption cloth and silk of the present invention, when above-mentioned metal through metal processing comprised a plurality of metal cluster, this metal cluster preferably had the arithmetic mean of the major diameter of 2～200nm, more preferably has the arithmetic mean of the major diameter of 5nm～100nm.Above-mentioned metal through metal processing has discontinuous metal cluster, thereby between each metal cluster, is easy to generate the gradient of conductivity.As long as the arithmetic mean of the major diameter of metal cluster is more than the 2nm, just efficient absorbs noise well more.In addition, as long as the arithmetic mean of the major diameter of metal cluster is below the 200nm, the homogenizing of then above-mentioned metal through metal processing can not formed the gradient of good conductivity by excessive promotion.For the noise absorption cloth and silk that contains superfine fibre, owing to form above-mentioned clustering architecture easily, thereby can show higher noise absorption performance.
Above-mentioned major diameter can be measured by the image of SEM type electron microscope.
For noise absorption cloth and silk of the present invention,, can on its one or both sides, carry out following processing in order to make its practicability in e-machine etc.For example, in order to prevent short circuit, can carry out insulation processing.Particularly, can carry out the coating of resin, the lamination of resin, the applying of insulation film etc.In addition, in order it to be fitted in the e-machine and give fusible processing, be provided for being installed on screw on the housing of e-machine, screw hole etc.Carry out in order to fit in the e-machine give fusible processing since make to e-machine fixedly become simpler and easy, be preferred therefore.
Noise absorption cloth and silk of the present invention is applicable in e-machine etc. as shown in following, can absorbs noise.For example; Can be attached in the electronic units such as LSI; Can be attached at circuit or its back sides such as glass epoxy resin basal disc, FPC, can be attached on the power transmission sequence on the circuit, the position of electronic unit etc. is installed on the circuit, can be attached at the cable of connector part, connection connector and other devices, parts etc. etc.; The back side or the surface that can be attached at housing that electronic part apparatus is housed, keep body etc. perhaps can be coiled on the cables such as power line, transmission line.
In addition; Consider the convenience of use, according to hope, can be on the surface or the back side be provided for fitting in the adhesion coating (bonding dose of PUR, common adhesive etc.) of above-mentioned e-machine etc.; And when needing insulating properties; Electric insulation layer (the polymer laminate layer that is fitted with film can be set, through making up other insulating properties materials etc., thereby can form electric insulation layer) can be set on the surface of above-mentioned e-machine etc. or the back side.
Embodiment
Below, enumerate embodiment and further specify the present invention, but the present invention does not receive any qualification of these embodiment.
Assay method and evaluation method are for being described below.
[(1) microstrip line (MSL) method]
According to IEC specification 62333-2, measure through the microstrip line method.As shown in Figure 6, use the microstrip line fixture 7 (Microwave FactoryCo., Ltd. system) of impedance and network analyzer 9 (Agilent Technologies Corporation system model N5230C) to measure through the S parametric method with 50 Ω.The size of the sample 8 of noise absorption cloth and silk is 5cm * 5cm, places it on the microstrip line fixture 7 and measures.Need to prove, among Fig. 6, symbol 10 expression microstrip lines.
With the reflection loss amount (S11) of each frequency measurement S parameter with through attenuation (S21), calculate loss late by following formula (1).
Loss late (Ploss/Pin)=1-(S11
2+ S21
2)/1 formula (1)
[(2) surface resistivity]
Use the system low ohmmeter Loresta-GP of Mitsubishi Chemical Ind, model MCP-T600 to measure through 4 terminal methods.During mensuration, be made as n=3, use its mean value.
[(3) loop aerial A method]
62333-2 measures through the annular-ring microstrip antenna method according to the IEC specification.Shown in figure 11; Use has annular-ring microstrip antenna fixture 12 (the Microwave Factory Co. of 2 annular-ring microstrip antennas 11; Ltd. make) and network analyzer 9 (Agilent Technologies Corporation system model N5230C), measure through the S parametric method.The size of the sample 8 of noise absorption cloth and silk is 5cm * 5cm, places it on 2 annular-ring microstrip antennas 11, measures the coupling attenuation amount.
[(4) loop aerial B method]
According to IEC specification 62333-2, measure through the annular-ring microstrip antenna method.Shown in figure 12; Use has annular-ring microstrip antenna fixture 12 (the Microwave Factory Co. of 2 annular-ring microstrip antennas 11; Ltd. make) and network analyzer 9 (Agilent Technologies Corporation system model N5230C), measure through the S parametric method.The size of the sample 8 of noise absorption cloth and silk is 5cm * 5cm, places it between 2 annular-ring microstrip antennas 11, measures to see through attenuation.
[(5) noise absorption property visualization device (magnetic field intensity mensuration)]
Use (strain) noise institute system, printed circuit board (PCB) solution electromagnetic analysis system (model: ESV-3000) measure.Printed circuit board (PCB) in the mensuration uses the demonstration substrate of noise institute system.Measure probe and use noise institute system vertical magnetic field probe.The mensuration frequency setting is 100～400MHz, draws the value of peak magnetic field intensity each measuring point, in this frequency range.The size of sample is 8cm * 8cm, before sample being attached at the demonstration substrate, observes the magnetic field intensity attenuation with the difference of afterwards magnetic field intensity.
[(6) noise absorption property visualization device (electric field strength mensuration)]
Use (strain) noise institute system, printed circuit board (PCB) solution electromagnetic analysis system (model: ESV-3000) measure.Printed circuit board (PCB) in the mensuration uses the demonstration substrate of noise institute system.Measure probe and use noise institute system vertical magnetic field probe.The mensuration frequency setting is 250～700MHz, draws the value of peak electric field strength each measuring point, in this frequency range.The size of sample is 8cm * 8cm, before sample being attached at the demonstration substrate, observes the electric field strength attenuation with the difference of afterwards magnetic field intensity.
[(7) permeability determination method]
Using the film permeability to measure system's (insulting and the system model PMF-3000 of electronics corporation) measures.For fixing sample, it is attached on the PET resin sheet measures with two sides adhesive tape (nichiban makes NW-5).During mensuration, set n=3, use its mean value.
[(8) average perforate footpaths (μ m)]
Use fine pore measure of spread device (the perm-porometer) (model: CFP-1200AEX) of PMI company.The Silwick of PMI corporate system is used in immersion liquid, sample is immersed in the immersion liquid outgas fully, measures.
For this determinator; Filter is immersed in the liquid of known surface tension force in advance; Whole pores with filter are exerted pressure to filter by the state that the film of liquid covers, and measure the aperture of the pore that is calculated by the surface tension of pressure that destroys liquid film and liquid.Formula (2) below using is calculated average perforate footpath.
D=C * r/P formula (2)
(in the formula, d (unit: μ m) be the perforate footpath of filter, r (unit: N/m) be the surface tension of liquid, P (unit: be the ruined pressure of liquid film in this aperture Pa), and C is a constant.)
Put on the pressure P that is dipped in the filter in the liquid flow (wetting flow) when low pressure is changed to high pressure continuously if measure to make, the liquid film of maximum pore is not destroyed yet under the initial pressure, thereby flow is 0.When raising pressure gradually, the liquid film of maximum pore is destroyed, and produces flow (emitting bubble point).When further raising pressure gradually, flow increases corresponding to each pressure, and the liquid film of minimum pore is destroyed, and is consistent with the flow (dry flow) of drying regime.
In this determinator, the value that the wetting flow under certain pressure is obtained divided by the dry flow under this pressure is called accumulation filter flow (unit: %).In addition, will be called mean flow pore size in the aperture that accumulation filter flow reaches ruined liquid film under 50% the pressure, with its average perforate footpath as employed cloth and silk among the present invention.
In this specification, the maximum diameter of hole does, cloth and silk is measured as filter, and accumulation filter flow is the scope of 50%-2 σ,, reaches the aperture of ruined liquid film under 2.3% the pressure at accumulation filter flow that is.
[basic weight of (9) cloth and silk]
According to the method for stipulating among the JIS L-1906:2000, take the sample quality measurement of 3 vertical 20cm * horizontal 25cm among the every 1m of specimen width, thereby the quality that this mean value is scaled per unit area is obtained the basic weight of cloth and silk.
[thickness of (10) cloth and silk]
According to the method for stipulating among the JIS L-1906:2000,10 place's thickness among the every 1m of width are measured, the thickness of its mean value as cloth and silk.Carry out with loading 9.8kPa.
[diameter of (11) fiber]
Fiber diameter (μ m): by electron micrograph, at random pick up fiber, thereby obtain from the diameter that photo reads them.Value is the arithmetic mean of n=50.
[thickness of (12) metal]
Use SEM type electron microscope (Hitachi High-technologies Co.Ltd corporate system SEM model S-4800), obtain through the SEM photograph image.In addition, the major diameter of metal cluster is also obtained through the SEM photograph image.Each value adopts the arithmetic mean of n=30.
[(13) applying model test]
Go up in whole of the one side of the sample of 5cm * 5cm and to attach the two sides adhesive tape.Then, the another side of two sides adhesive tape is attached on the hemisphere of the employed table tennis of table tennis, to this state and attach easness and judge according to following.
◎: attach easily, attach under the state of back and also do not observe unfavorable condition.
Zero: attach easily, but observe projection, the wrinkle of a part of sample, the breakage of sheet material etc.
△: can attach, but observe the breakage etc. of the whole projection of sample, wrinkle, sheet material.
*: be very difficult to attach, observe the breakage of the whole projection of sample, wrinkle, sheet material etc.
[embodiment 1～38]
Through the noise absorption cloth and silk of following method manufacturing embodiment 1～38, estimate the noise absorption performance.Among the embodiment 1～3,11～13 and 15, the spun-bonded non-woven fabrics (E05050) that uses the mylar that utilizes ASAHI KASEI FIBERS CORPORATION system is as cloth and silk.Vapor deposition uses vacuum deposition apparatus and as the Nilaco system standard board (model: SF-106 tungsten) implement of thermal source.In vacuum degree 5 * 10
-5Be primary condition to apply voltage 5V, 180 seconds vapor deposition time under the torr.
With the primary condition of above-mentioned condition as metal processing; In order to make quantitative changeization through the metal of metal processing; The heat of control vacuum degree, arrival vapor deposition source (according to circumstances; Arrive the electric weight of thermal source) and vapor deposition time, adjust and make it have the common logarithm value of surface resistivity within the scope of the present invention.Usually the metal that carries out metal processing for example, changes through making the vapor deposition time for fixedly the time, the amount of the metal of can easy adjustment processing through metal.For example, make when the amount of the metal of metal processing reduces, the vapor deposition time is reduced, and when increasing the amount through the metal of metal processing, can increase the vapor deposition time.
Condition among each embodiment is shown in table 1, replenishes as follows.Need to prove that about the permeability of the noise absorption cloth and silk of embodiment 1～12 and 17～23, the mean value of μ ' is approximately 1.0 when the scope of 0.5～6GHz, and μ " mean value when the scope of 0.5～6GHz, be approximately 0.0.
Among the embodiment 2 and 3, change the vapor deposition time of embodiment 1, make the varied in thickness of metal.
Among the embodiment 4～10 and 17～23, except cloth and silk is changed to as follows, identical with embodiment 1.
Embodiment 4:PU5040 (raw material: polypropylene, ASAHI KASEI FIBERS CORPORATION system)
Embodiment 5:N05050 (raw material: nylon 6, ASAHI KASEI FIBERS CORPORATION system)
Embodiment 7:Precise AS080 (raw material: PET, ASAHI KASEI FIBERS CORPORATION system)
Precise AS030, AS080 be that kind as shown in table 1 will as the layer of the spun-bonded non-woven fabrics of common fiber with layer carry out the laminated nonwoven fabric that lamination forms in proper order as the layer of the melt spraying non-woven fabrics of superfine fibre and spun-bonded non-woven fabrics with this.
Among the embodiment 8,9,10, except using the different following cloth and silk of fibre diameter, basic weight and thickness respectively, identical with embodiment 1.
E05020, E05030, E05120 (raw material: PET, ASAHI KASEIFIBERS CORPORATION system)
Embodiment 17: staple fiber nonwoven fabric (Wet-laid non-woven fabric: Pure-re040BC raw material: PET A Bo system paper company system)
Embodiment 18: with staple fiber nonwoven fabric (spunlace nonwoven fabrics Sontara8005 raw material: PET DuPont corporate system) carry out using after the rolling processing.
Embodiment 19:Tyvek (raw material: polyethylene, DAF S corporate system)
Embodiment 20: staple fiber nonwoven fabric: Unisel メ Le Off ィ ッ ト BT030EW (Supreme Being people's system)
Embodiment 21: melt spraying non-woven fabrics: E3008 (raw material: PET, ASAHI KASEI FIBERS CORPORATION system) is carried out using after the rolling processing.
Embodiment 22 and 23: use the taffeta that forms by ester fiber.
Among embodiment 11 and 12: the embodiment 11, the voltage that applies of vapor deposition is set at 7.5V, and in embodiment 12, the voltage that applies of vapor deposition is set at 10V, in addition form the noise absorption cloth and silk according to embodiment 1.
Among embodiment 13 and 14: the embodiment 13,, identical with embodiment 1 except metal is changed to the Ag.Among the embodiment 14, use Precise AS030, and metal is changed to Ag, form the noise absorption cloth and silk according to embodiment 1 in addition as cloth and silk.
Among embodiment 15 and 16: the embodiment 15,, identical with embodiment 1 except metal is changed to the Ni.Among the embodiment 16, use Precise AS030, and metal is changed to Ni, form the noise absorption cloth and silk according to embodiment 1 in addition as cloth and silk.
Embodiment 24: general PETG is extruded the long fibre crowd of long filament towards moving collection face through spun-bond process under 300 ℃ of spinning temperatures; To carry out spinning in spinning speed 3500m/ minute; Electricity about making it with 3 μ C/g through corona charging is also fully opened fibre, and making the 5cm rate of change that has that is formed by fiber diameter 11 μ m long filaments is that inhomogeneity below 15% do not combine long fibre fleece (web) (below be sometimes referred to as " fiber web layer A ") with the about 7.5g/m of basic weight
2Be formed at and capture on the wire side.
Then, in 300 ℃ of spinning temperatures, 320 ℃ of heated air temperature, air 1000Nm spues
3Through meltblown PETG (melt viscosity η sp/c 0.50) is carried out spinning under the condition of/hr/m, with the superfine fibre of fiber diameter 1.7 μ m as the about 5g/m of basic weight
2Random fiber net (below be sometimes referred to as " fiber web layer B ") directly spray towards fiber web layer A.Melting and spraying the distance setting of nozzle above fiber web layer A is 100mm, and the attraction that melts and sprays the collection face under the nozzle is set at 0.2kPa and wind speed is set at about 7m/sec.
Fiber web layer B, with the face of fiber web layer A opposition side on the long fibre fleece of PETG and the fiber web layer A of initial preparation are likewise opened fibre, prepare 3 layers the laminate web of fiber web layer A/ fiber web layer B/ fiber web layer A.
Then; Make above-mentioned 3 layers laminate web through carrying out thermo-compressed between 2 flat rolls; Obtain 3 layers the laminated nonwoven fabric of nonwoven layer A/ nonwoven layer B/ nonwoven layer A; Then through with metal in the processing of the enterprising row metal of the nonwoven layer A of the fiber web layer A that derives from initial formation, thereby form the noise absorption cloth and silk.
Except the extrusion capacity that changes resin,, form the noise absorption cloth and silk that contains laminated nonwoven fabric with different fibre diameters through operation likewise.The composition and the fibre diameter of resulting noise absorption cloth and silk are shown in table 1.
Embodiment 28 and 29: likewise carry out with embodiment 24; After forming 2 layers the laminate web of fiber web layer A and fiber web layer B; The laminate web that makes 2 layers is through carrying out thermo-compressed between 2 flat rolls; Acquisition has nonwoven layer A that derives from fiber web layer A and 2 layers the laminated nonwoven fabric that derives from the nonwoven layer B of fiber web layer B, thereby and through on nonwoven layer B, implementing metal processing formation noise absorption cloth and silk.The proterties of the noise absorption cloth and silk that obtains is shown in table 1.
Embodiment 33 and 34: do not form fiber web layer B, change the extrusion capacity of the resin when forming fiber web layer A, change fibre diameter, likewise carry out with embodiment 24 in addition, form the noise absorption cloth and silk that comprises the nonwoven layer A that obtains through spun-bond process.The proterties of the noise absorption cloth and silk that obtains is shown in Table 1.
Embodiment 35～38: further overlapping through nonwoven fabrics FinetexTechnology Global Limited system, that formed by the superfine fibre that utilizes method of electrostatic spinning (ELSP) to obtain on Precise AS030; Form laminated nonwoven fabric; And through metal being carried out metal processing, the noise absorption cloth and silk of cambium layer die mould in the nonwoven fabrics side that forms by superfine fibre.The basic weight of ELSP is 2g/m
2Or 1g/m
2The raw material of above-mentioned superfine fibre are nylon 6 in embodiment 35 and 36, and are PVDF in embodiment 37 and 38.
Need to prove that embodiment 24～37 and embodiment 1 likewise implement.
[comparative example 1～4]
Except change through the thickness of the metals species of metal processing and metal, make the noise absorption base material according to embodiment 1.
[comparative example 5～8]
Cloth and silk is changed to film, and then, except change through the thickness of the metals species of metal processing and metal, make the noise absorption base material according to embodiment 1.
Need to prove, in the comparative example 5～7, as above-mentioned film; Use Teijin tetoron film (model G2:16 μ m, model S:188 μ m), and in the comparative example 8, as above-mentioned film; Use DU PONT-TORAY CO., LTD. system model H type: 25 μ m.
[comparative example 9]
As the noise absorption base material, commercially available goods (Busteraid model R4N) have been estimated.
The result of embodiment 1～38 is shown in table 1, and the result of comparative example 1～9 is summarized in table 2.And then the mensuration result of the microstrip line method of embodiment 1, embodiment 4, embodiment 6 and comparative example 6 is shown in Fig. 7～10.
The coupling attenuation amount based on loop aerial A method of the noise absorption cloth and silk of embodiment 6 and the noise absorption base material of comparative example 6 is shown in Figure 13 and 14 respectively.In addition, the attenuation that sees through based on loop aerial B method with the noise absorption base material of the noise absorption cloth and silk of embodiment 6 and comparative example 6 is shown in Figure 15 and 16 respectively.The drawing result based on the magnetic field intensity of noise absorption property visualization device that attaches demonstration substrate before the noise absorption cloth and silk is shown in Figure 17, and the drawing result that will attach the magnetic field intensity of the demonstration substrate behind the noise absorption base material of noise absorption cloth and silk and comparative example 6 of embodiment 6 is shown in Figure 18 and 19 respectively.In addition; The drawing result based on the electric field strength of noise absorption property visualization device that attaches demonstration substrate before the noise absorption cloth and silk is shown in Figure 20, and the drawing result that will attach the electric field strength of the demonstration substrate behind the noise absorption base material of noise absorption cloth and silk and comparative example 6 of embodiment 6 is shown in Figure 21 and 22 respectively.
Can know that from these results the noise absorption performance of noise absorption cloth and silk of the present invention is in being brought by the magnetic field inhibited effect, by electric field suppress that effect brings bigger.
Need to prove, in Figure 17～22, symbol 13 expression demonstration substrates.
[table 1]
[table 2]
[table 3]
[table 4]
Utilizability on the industry
Noise absorption cloth and silk of the present invention is preferred for being installed in the noise absorption article in the e-machine.For example, can through on the housing that is installed in e-machine, be attached at electronic unit or transmission line is first-class uses.
Claims (12)
1. a noise absorption cloth and silk is characterized in that, the noise absorption cloth and silk that it processes through metal at least one face of cloth and silk for metal,
In the scope of common logarithm value 0～4 of the surface resistivity of the face of metal processing.
2. noise absorption cloth and silk according to claim 1, wherein, inner conductivity is also littler through the conductivity of the face of metal processing than said metal.
3. according to claim 1 or 2 described noise absorption cloth and silks, wherein, said cloth and silk is the nonwoven fabrics that is formed by synthetic continuous fibre.
4. according to each described noise absorption cloth and silk in the claim 1～3, wherein, said cloth and silk comprises the layer of the fiber with the fibre diameter below the 7 μ m.
5. according to each described noise absorption cloth and silk in the claim 1～4, wherein, said metal carries out metal processing through the metal evaporation method.
6. according to each described noise absorption cloth and silk in the claim 1～5, wherein, the thickness of said metal is 2～400nm.
7. according to each described noise absorption cloth and silk in the claim 1～6, wherein, the thickness of said cloth and silk is 10～400 μ m, and basic weight is 7～300g/m
2
8. according to each described noise absorption cloth and silk in the claim 1～7, wherein, said cloth and silk is through rolling processing.
9. according to each described noise absorption cloth and silk in the claim 1～8, wherein, the average perforate of said cloth and silk directly is 0.5 μ m～5.0mm.
10. according to each described noise absorption cloth and silk in the claim 1～9, wherein, said metal does not have the metal of magnetic for one or more.
11., wherein, be able to carry out metal processing thereby said metal carries out vapor deposition through the metal that one or more is had valve action according to each described noise absorption cloth and silk in the claim 1～9.
12. noise absorption article, it comprises each described noise absorption cloth and silk in the claim 1～11.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009284054 | 2009-12-15 | ||
| JP2009-284054 | 2009-12-15 | ||
| PCT/JP2010/072570 WO2011074609A1 (en) | 2009-12-15 | 2010-12-15 | Noise absorbing fabric |
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| CN102656962A true CN102656962A (en) | 2012-09-05 |
| CN102656962B CN102656962B (en) | 2016-06-01 |
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| CN201080057216.1A Active CN102656962B (en) | 2009-12-15 | 2010-12-15 | Noise absorption cloth and silk |
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| US (1) | US9972913B2 (en) |
| EP (1) | EP2515624B1 (en) |
| JP (2) | JP5722608B2 (en) |
| KR (1) | KR101515693B1 (en) |
| CN (1) | CN102656962B (en) |
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| CN113165339A (en) * | 2018-11-30 | 2021-07-23 | 积水化学工业株式会社 | Conductive nonwoven fabric |
Also Published As
| Publication number | Publication date |
|---|---|
| US9972913B2 (en) | 2018-05-15 |
| EP2515624B1 (en) | 2017-06-14 |
| US20120247868A1 (en) | 2012-10-04 |
| TWI586251B (en) | 2017-06-01 |
| JP2014197715A (en) | 2014-10-16 |
| JP2011146696A (en) | 2011-07-28 |
| WO2011074609A1 (en) | 2011-06-23 |
| EP2515624A4 (en) | 2013-11-27 |
| JP5722608B2 (en) | 2015-05-20 |
| TW201141367A (en) | 2011-11-16 |
| CN102656962B (en) | 2016-06-01 |
| KR20120087988A (en) | 2012-08-07 |
| KR101515693B1 (en) | 2015-04-27 |
| EP2515624A1 (en) | 2012-10-24 |
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